Add U.S. Rep. Henry Bonilla, R-San Antonio, to the list of people who'll change courses, if others change courses first.Bonilla is now openly saying he will run for the U.S. Senate if Kay Bailey Hutchison decides not to seek reelection next year. She's considering a run for governor in 2006, and since she's up for reelection at the same time, she'd have to give up the federal perch to try for the state job. Bonilla has been talking to Republicans about a possible run for some time, but came out in radio interviews in San Antonio and Lubbock, saying he'd like Hutchison's job if she gives it up. That would be an up-or-out race for him as well. Hutchison and Comptroller Carole Keeton Strayhorn have been circling Gov. Rick Perry for months (two years, in the comptroller's case) and while they haven't committed to anything, nobody in Austin would be surprised to see a three-way GOP primary a year from now. The seats emptied by the two most prominent females in state politics would set off two more races. Agriculture Commissioner Susan Combs is already raising money for a comptroller run; others have talked about it but haven't been as active in positioning themselves for a contest in the March 2006 primary, or in the November general election. Two names most often mentioned for Comb's spot -- she has said she won't be running for reelection in any case -- are state Sen. Todd Staples, R-Palestine, and state Rep. David Swinford, R-Dumas. Other possible candidates include Rep. Charlie Geren, R-Fort Worth, former Rep. Tom Ramsay, D-Mount Vernon, and Democrat David Cleavinger of Wildorado. The job's political attractiveness was considerably enhanced when Perry turned it into a launching pad for his successful run for lieutenant governor in 1998. A U.S. Senate seat, on the other hand, has always been a plum, and Texans who win those spots tend to hang on to them for two or three or four six-year terms. John Cornyn, who won Phil Gramm's spot in 2002, isn't going anywhere soon. Hutchison, who's been in place since 1993, when she replaced Lloyd Bentsen in the Senate, is ending her second term, as we've said, next year. Gramm held his spot for three terms, and Bentsen was in the Senate for almost four terms (he resigned to become U.S. Treasury secretary). Put it another way: Hutchison is only the third person elected to her spot in the Senate since 1957 (we're leaving out Bob Krueger, who served half a year between his appointment to the job and his loss to Hutchison in a special election); Cornyn is the third holder of the other seat since 1961. It's the kind of rare opportunity that brings out the ambitions of political people in both parties. Barbara Radnofsky, a Houston lawyer who's been testing the waters for almost a year, is expected to run for the seat. Ron Kirk, the former Dallas mayor defeated by Cornyn two years ago, is often mentioned as a contender. Former U.S. Rep. Jim Turner, D-Crockett, has said he would like to run for statewide office if the right opportunity opens up, and he has more than $1 million in seed money sitting idle in his federal campaign account. On the Republican side, the 800-pound gorilla is probably Lt. Gov. David Dewhurst: He's wealthy enough, apparently, to self-fund a race if he had to; he's won two statewide elections against strong opponents; and he hasn't stepped in any of the sorts of potholes that spoil political fairy tales. Putting Dewhurst in the race would likely scare off other Republicans. But without him, there are tire-kickers galore, including two Bonilla colleagues, U.S. Reps. Kay Granger, R-Fort Worth, and Pete Sessions, R-Dallas.