Sen. Marco Rubio will not participate in the Iowa Straw Poll, his campaign team confirmed Saturday. The Florida senator and 2016 hopeful’s decision marks the latest blow to the August event long considered a staple on the Republican road to the presidential nomination. Jeb Bush, Sen. Lindsey Graham and Mike Huckabee have all said they won’t participate this cycle. Many, including Gov. Scott Walker and Sen. Rand Paul, have yet to signal if they will attend.