Union PAC contributions and legislative voting

Are union PACs able to affect legislative voting patterns with campaign contributions? Unlike previous studies addressing this question, this work measures the likelihood of a legislator supporting union (AFL-CIO) issues instead of isolating specific bills for study. Furthermore, the influence of union PAC money in both congressional chambers is examined. The results are mixed: apparently, organized labor has been able to influence labor legislation with campaign money in some election cycles, but in others, they are less effective.