Here's the interactive map from CQ Politics:
As they gear up for the 2010, Democrats appear secure in their House majority they won with a big gain in 2006 and reinforced with another advance in 2008.
CQ Politics' election analysts found 100[snip] with races where either major party stands a chance of winning the seat. That includes three true tossup seats, many districts that are only slightly competitive and some highly competitive. Of the 100 races worth closely watching, Democrats are defending 59 of the seats.
While at least some net gain is a very plausible possibility for the Republicans, it would take a huge reversal of political fortune for the party to reclaim a House majority. Of the 335 contests that CQ Politics' election analysts rate as Safe for the incumbent party, 198 are currently Democratic (including that one vacant seat) and just 137 are Republican.
In addition, the Democrats are solidly favored in 31 of the 59 competitive contests for seats they currently hold, plus the Republican seat in Louisiana's 2nd District. So if the Democrats were to win only their Safe seats and those rated Democrat Favored, they would have a total of 230 -- well above the majority threshold of 218 seats.read more..