Texans headed to the polls this week to vote on 10 constitutional amendments and, in some cities, for mayoral and city council positions. Seven of the 10 constitutional amendments passed, with voters rejecting propositions giving new bonding authority to counties, a conservation district in El Paso and tax breaks for landowners who practice good water stewardship. The dismal turnout, 5.5 percent, was down from 8.1 percent in 2009. The one statewide race on the ballot, a House seat in Brazos County, is headed for a runoff between Republicans Bob Yancy and John Raney. The biggest mayoral contest in the state, though, saw a clear winner — but by a thin margin: Incumbent Annise Parker won with 50.9 percent of the vote, narrowly avoiding a runoff.