Political Wire has this story coming in from Stuart Rothenberg:

Former New Hampshire Gov. Jeanne Shaheen, who narrowly lost a 2002 Senate race against Republican John Sununu, has reversed her earlier decision against running next year and, after a heavy recruiting effort by many Democrats, including Massachusetts Senator Ted Kennedy, appears to be leaning toward a re-match with Sununu.

Insiders stress that Shaheen has not made a final decision, but they agree that the betting at the Harvard Institute of Politics, where she is the director, and in savvy political circles in New Hampshire, is that she is now likely to enter the Senate race.

In Nebraska, former Senator (and former Governor) Bob Kerrey also appears to be inching toward entering the state’s Senate contest, assuming that incumbent Senator Chuck Hagel (R) decides not to seek reelection. Kerrey would not challenge Hagel if the Republican decides to seek another term, which many think is not likely.

Kerrey of course is a former rockstar in the Democratic Party, and a rival of Bill Clinton in 1992 for the nomination. He is immensely popular in the state, and if Hagel steps down he would most likely win the election. However, all polling seems to indicate that if Hagel remains the seat will be safe for Republicans.

New Hampshire is an entirely different story with Sununu being one of the last federally elected Republicans in the region. 2006 was the start of a New England realignment and with Shaheen running, the vulnerable Senator could definitely fall. In the last time the two faced off Sununu won by only 18,817 votes in a solidly Republican aligning year.