A liberal who appears to be conservative to appeal to the right with conservative sounding promises. However, when voted in, the liberal goes back to his or her liberal ways. A common tactic by the left.
Jon Corzine promised to never raise taxes on New Jersians to appear to be a conservative. He really was a conswervative, showing his true colors when he raised the sales tax to 7% and otherwise broke his promise to never raise taxes.