We noted recently that the latest PPP poll of New Hampshire showed libertarian candidate Gary Johnson taking 7 percent of the vote, and the new numbers from the Democratic polling firm out of Arizona show something similar.

In Arizona, Johnson gets 9 percent of the vote, compared with 45 percent for Mitt Romney and 41 percent for President Obama. Another 6 percent are undecided. In a straight head-to-head, the state is less in play than Democrats had hoped, with Romney getting 50 percent to Obama's 43 percent.

But, PPP pollsters note:

One thing that could make the race more competitive in Arizona, perhaps more so than other states, is Gary Johnson's presence on the ballot as the Libertarian candidate. He pulls 9% in Arizona and he takes a lot more support away from Romney than he does Obama, narrowing Romney's lead in the state to 45-41. History suggests it's quite unlikely Johnson would really pull 9% in the end but it shows how many voters are unhappy with their main choices in this race.

That last point can't be ignored — in a close race in which voters are not in love with either of the main candidates, what if a number of people decide to go for Door No. 3?