Another "tail wags dog" story?

 

In the recent news I've heard many say that Republican Senators John McCain, Susan Collins, and Lisa Murkowski "betrayed their party" by voting against the recent Republican healthcare replacement bill. I find that statement shocking and disappointing. 

Should you vote for your congressman or Senator to go to Washington and vote how Paul Ryan or Mitch McConnell (if they are a Republican) or Nancy Pelosi or Chuck Schumer (if they are a Democrat) tells them to, or should you vote to send them to Washington to represent YOU and YOUR interests? And if your interest sometimes differs with whatever their party leader wants, who should they owe their allegiance to?