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.