Today is the first day for people wanting to run in the Democratic or Republican primary to file their candidacy. The month-long period is often a mix of the expected — like Governor Perry filing to run for re-election — and the unexpected. Houston Mayor Bill White running for governor could set off a chain reaction among Democrats to enter other statewide races, for instance. But one of the most interesting phenomena this year is the number of so-called Tea Party Republicans entering the primaries. Ben Philpott, covering the Texas governor's race for KUT News and The Texas Tribune, has this report.