9:47: Perhaps the most talked-about moment of the whole evening thus far has been Speaker Boehner's speech on the House floor in which, some say, he mocked President Obama. Watch the video to the left.
9:39: The battle in Congress notwithstanding, Dow futures are up 43 points. Market pros are mostly dismissing the prospect of a short-term shutdown as posturing.
9:28: No word on the House's next plans. Two hours, 32 minutes to go.
9:24: The Senate has just voted to reject the latest House bill, passed only 40 or so minutes ago. The universally expected move means the House should get a fresh continuing resolution with no Obamacare provisions by 10 p.m. ET or thereabouts.
9:11: Within the last few minutes President Obama tweeted via the White House account, urging Congress to pass a budget and avert a shutdown. (The -bo at the end is is the president's customary signature on a tweet).
9:04: CNN reports, citing sources, that it is possible there may be one or even two more volleys tonight (House passes a bill, Senate rejects the bill, Senate passes their own bill and sends it back to the house).
9:00: Various members of the White House press corps reporting that the White House Briefing Room is being kept open until 12:30 a.m. ET. (The shutdown begins at midnight).
8:55: Watch Sen. Cruz on his plan to donate his salary during a shutdown.
8:54: Harry Reid, on the Senate floor, says House Republicans "have lost their minds." T-minus 3 hours, 6 minutes until the shutdown.
8:41: The U.S. House of Representatives has voted to approve a government funding bill that also delays portions of the Obamacare health insurance initiative.
8:30: More timeline, from NBC's Chuck Todd - the House is expected to get a spending bill back from the Senate around 10 p.m. ET.
8:28: Wolf Blitzer on a new poll that shows Congress has a 10 percent approval rating: "Chances are influenza polls better than that."
8:27: About 10 minutes in, about 2/3 of the House has yet to vote.
8:21: Via CNBC's DC team, latest word is that the Senate will reconvene as soon as 9 p.m. ET to "table" the latest House resolution, effectively killing it immediately.
8:18: The House appears to have begun voting.
8:07: Boehner speaking on the House floor. "Let's listen to our constituents and lets treat them they way they would want to be treated," he said to applause.
8:07: "I can never forgive Ted Cruz for what he's done," King said. He also expects a series of back-and-forth votes throughout the night.
8:05: Rep. Peter King (R-NY) tells CNN there was nothing personal about his participation in the failed GOP revolt in the House a few minutes ago.
"I want to end this process. It's going nowhere. It's a dead end," he said.
7:51: Sen. Ted Cruz (R-TX) live on "Kudlow Report." Cruz spoke for 21 straight hours in the Senate last week in an effort to defund Obamacare as part of the government funding process.
"I don't think we should have a government shutdown, but at the same time both Harry Reid and President Obama are refusing to negotiate at all. President Obama will negotiate with Iran but he wont negotiate with leaders of Congress," Cruz said.
7:49: Tonight's shutdown meal, per Robert Costa and courtesy Congressional leadership:Chipotle.
7:37: We're told the House is due to vote sometime around 8:15 p.m. ET to 8:30 p.m. ET on the latest plan. If the measure passes, the ball goes back in the Senate's court.
7:34: Duly noted: About 61 percent of respondents in CNBC.com's unscientific poll want the government to be shut down tonight, with 39 percent against.
7:26: Some talk that the House could vote within the next hour on the latest version of its continuing resolution. What's not immediately clear is what condition that resolution would have -- defunding Obamacare, delaying its implementation, eliminating the medical device tax etc.
7:24: Everyone appears to have an opinion on the looming shutdown. Everyone.
7:17: A House Republican "revolt," as some are calling it, has just failed. The procedural move would have likely meant a "clean" continuing resolution without an Obamacare link.
6:56: ABC's Jon Karl reports Pres. Obama and Speaker Boehner spoke by phone, their first conversation since last Friday -- mostly so each could reaffirm their positions.
6:52: CNN airing the results of a poll, asking whether the political parties were behaving like spoiled children. Some 69 percent said "yes" for the Republicans, 58 percent for the Democrats. (About 44 percent said President Obama was himself acting spoiled).
6:43: House vote running behind schedule. As some reporting, including National Review'sRobert Costa (a CNBC contributor), there are divisions within the House GOP about another resolution that would attach Obamacare conditions.
6:32: Noted conservative blogger Erick Erickson weighs in with a rather pointed recommendation for House Republicans on what to do tonight.
6:27: "You owe it to the American people to hold a vote," Sen. Carl Levin (D-MI) said in a floor speech to House Speaker John Boehner.
Levin also calls a separate bill to pay soldiers during a shutdown "one travesty among many to be avoided."
6:12: Casey paraphrasing Moody's Mark Zandi now on the economic impacts of a shutdown. Zandi's forecasts were reported in a Bloomberg News story here the other day. (Zandi thinks a shutdown of even three weeks could take 1.4 percentage points off fourth-quarter GDP).
6:09: "This one is unique in the sense that you have on the one side Democrats in Congress and I think across the country united to continue the operations of government ... even if we want to make a point. You see a growing number of Republicans here in the Senate and across the country, even in the House over the last 24 hours or so ... saying 'let's just get the government funded so we can move forward,'" Sen. Robert Casey (D-PA) said in a floor speech.
6:00: "A shutdown would hurt the financing of more than 1,000 small businesses a week in my state," Ohio. Sen. Sherrod Brown, a Democrat, said on the Senate floor.