Former Rep. Steve LaTourette (R-OH) was one of the more labor-friendly Republicans in Congress. Those close ties are paying off for him as labor unions are a major donor to his "Defending Main Street" Super-PAC, which is targeting conservatives in upcoming primaries. So far, unions have contributed $765,000 to support LaTourette's efforts. The figure represents 86% of the PAC's current cash-on-hand.