So, republicans want to wait - in hopes of a republican president in November.  
For how long?
If a democrat becomes president, will they "wait" another 4 years? Another 8?
And, so it goes with the obstructionist, do-nothing republican majority. 
If this doesn't convince people that electing your congressman/ senator carefully is crucial, nothing will.  Your favorite candidate for president isn't going to make the difference!  It's who you send to Washington.  Vote very carefully.