Washington (CNN) -- Mitt Romney has steadfastly refused to release more than two years of tax returns despite mounting pressure from the Obama campaign and even some fellow Republicans, who are beginning to grumble both publicly and privately that Romney should disclose more details about his income and put the nagging issue behind him.
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33 out of 100 seats are up for election. 51 are needed for a majority.
|Seats gained or lost||+2||-2|
* Includes two independent senators expected to caucus with the Democrats: Angus King (Maine) and Sen. Bernie Sanders (Vt.).
All 435 seats are up for election. 218 are needed for a majority.