By Paul Steinhauser
CNN Washington Bureau
WASHINGTON D.C. (CNN) -- It may not grab the headlines like the race for the White House, but the battle for the Senate is heating up.
Democrats took back both houses of Congress last November, but they hold razor-thin majorities. In the Senate, they hold a 51-49 margin. Their advantage in the House is a couple of percentage points better, 233-202.
With such a small edge, you would think Republicans would have a good shot at taking back the Senate in 2008. But the numbers tell a different story.
Of the 34 Senate seats being contested next year, Republicans hold 22. And with three Republican senators retiring and with four facing difficult re-election bids, Republicans have a tough task ahead of them in trying to recapture the upper chamber of Congress.
On Thursday, Republicans got some good news when Agriculture Secretary Mike Johanns announced he was resigning. A GOP source said Johanns has told friends he will run for retiring Sen. Chuck Hagel's Senate seat in Nebraska.
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