Senator Ted Cruz (R-TX) has capitalized on the national trend toward skepticism over the RFS among Republican voters, drawing the attention of the ethanol lobby, which perceives the danger of such opposition giving the tea party caucus the upper hand in intra-party politics, a key factor if the Republicans maintain the majority in the Senate.The Iowa caucuses are scheduled for 1 February, and the polls are tightening with the two major ones released most recently showing the top two candidates, Donald Trump and Senator Ted Cruz (R-TX), within the margin of error:

NBC/WSJ/Marist (released 10 January): Cruz 28, Trump 24, Rubio 13 and Carson 11 Quinnipiac (released 11 January): Trump 31, Cruz 29, Rubio 15 and Carson 7

What has become th...