A final Quinnipiac poll ahead of the Iowa caucus finds Donald Trump’s support steady at 31 percent while Texas Sen. Ted Cruz (R-TX)97% has dropped 5 points in the last week. Cruz currently has the support of 24 percent of likely caucus-goers, according to the poll. Last week, his support was 29 percent. The poll also shows a late increases in support for third-place Sen. Marco Rubio (R-FL)79% . The Florida senator has 17 percent support, up from 13 percent last week. Trump’s current 7-point lead in the poll, released on the day of the Iowa caucus, seems to come...