Paul Kane's article in The Washington Post today sums up the 2012 election pretty well -- unless one party gains a large majority in the Senate, then the gridlock in Washington won't end regardless of who wins the White House. According to the article, the Democrats have 23 Senate seats to defend, compared to just 10 for the Republicans, during this cycle. There will be a close battle for the majority, but it likely won't yield a large majority either way.
Given that likelihood, it would be interesting to have the major presidential candidates asked specifically about how they would appeal to a divided Senate. For some earlier musings on whether there will be more or less gridlock with Romney rather than Obama in the White House, see this post from January.