Definition: In this task, you will be presented with a passage and have to answer a question based on your understanding of the events inferred from the passage. Try to find the best answer that is most likely to fill in "_". Note that the URLs in the text have been replaced with [Link].
Input: Washington (CNN) As year-end funding decisions loom, a familiar pattern is repeating, with House conservative Republicans playing hardball to pull their colleagues to the right. And moderates are increasingly tiring of it -- especially after Tuesday's repudiation of a candidate seen as emblematic of the GOP's right flank in the Alabama special election. Government funding and efforts to abolish Deferred Action for Childhood Arrivals, a popular program for young undocumented immigrants, have some moderates increasingly wondering: Why can't we play hardball, too? Moderate Republicans and House members in districts that are either generally competitive or which Hillary Clinton carried in the 2016 presidential election are starting to grow frustrated with the effectiveness of groups like the House Freedom Caucus in influencing legislation, often by withholding their votes as a bloc until demands are met.Some moderates are increasingly wondering: Why can't we play hardball, too?The effectiveness of the House Freedom Caucus is a source of frustration for vulnerable members 
 Question:"And _ has been effective at it, they can put their votes together, and we need to do that from time to time, (though) we need to pick our fights carefully."

House Freedom Caucus