This story was revised to correct Hensarling quote. He said 72 hours.
The couple never formally backed any candidate. An earlier version mischaracterized their public political support.
This story was updated to correct the spelling of Ari Fleischer's last name in one reference.
This story was revised to correct that Democrats failed to gain control of Congress rather than lost control of Congress.
This story was revised to correct that NBC News has not called the race in California for legalization of recreational use of marijuana.
This story was revised to correct that Sen. Patty Murray of Washington is a Democrat.
This story has been updated to reflect that Jose Cordeiro is not a NASA energy advisor, but a founding faculty and energy advisor at the Singularity University at the NASA Research Park in Silicon Valley.
A fifth of respondents say if Trump wins, they will raise their forecasts for the stock market on average by 8 percent. And if Clinton wins, a fifth of respondents said they would lower their forecasts by 9 percent.
Shares of Twitter have fallen more than 21 percent so far this year. An earlier version misstated the percentage.
The Great Recession hit in late 2007. An earlier version misstated the year.