Democratic and Republican candidates are locked in tight races for Senate in Florida, Texas and Ohio, three states that have yielded increasingly close polls in recent weeks, according to a new survey. The Marist poll released Thursday showed slight leads for the incumbents in each state but within the margin of error, and two of the three were nearly tied. The poll found Texas Sen. Ted Cruz (R) with the largest lead, ahead of Democratic Rep. Colin Allred by 5 points, 51 percent to 46 percent....