U.S. stock index futures rose Wednesday, after major indexes touched two-month highs in the previous session, as Wall Street continued to be optimistic that lawmakers in Washington would soon seal a deal to avert falling off the "fiscal cliff."

On Tuesday, Republican House Speaker John Boehner offered a "Plan B" that would extend the Bush-era tax cuts for those earning up to $1 million, but the White House rejected the idea, saying it did not go far enough and would not pass through the Senate. The White House has proposed extending tax cuts to individuals making up to $400,000.