It appears that Jeb Bush is serious about replacing Mel Martinez in the US Senate:

Former Florida Gov. Jeb Bush is considering a bid for the United Sates Senate, Republican strategist Alex Castellanos told CNN Tuesday.

Republicans are urging Bush, the president's younger brother, to strongly consider making a bid for the seat currently held by outgoing Republican Sen. Mel Martinez. The first term senator announced Tuesday he would not run for reelection, setting off what's sure to be one of the most hotly-contested Senate battles in 2010.

Bush, who served as Florida governor from 1999 until 2007 and enjoyed high approval ratings, will take the next month to consider getting into the race, Castellanos said on CNN's The Situation Room. Castellanos is a CNN contributor. Bush also told the Politico he is "considering" getting into the race.

For those of you wondering, Bush received a "B" from the Cato Institute for his fiscal policy as Governor of Florida. His grade did fall over time because of spending.

Bush's rating from Cato:
2000: B
2002: A
2004: B
2006: C

While it's not a great indicator (his brother scored well on these reports while Governor of Texas), it gives you an idea of what he'd do. He does have baggage because of his last name and don't think it won't be an issue.