New Iowa poll has Jeb Bush in 4th place, Marco Rubio tied for 5th place

Jeb Bush and Marco Rubio continue to struggle in the polls — this time in a new Quinnipiac survey of voters in Iowa, the site of the first election in the Republican race for president. As has been the case in recent polls, Donald Trump and Dr. Ben Carson lead the field. Trump is at 27 percent in the Hawkeye State, while Carson is just six percentage points behind with 21 percent. Texas U.S. Sen. Ted Cruz is next with 9 percent. Then comes…