Looking at the U.S. from Europe it gets the impression that the senators are more influential in policy formation than their House counterparts.
The first explanation that comes to mind is that this more great influence depends on their small number, 100 vs. 435.
Nevertheless, I wonder, is this the only reason? To me, but I can be wrong, the numeric reason seems not enough as an explanation. In fact, thinking about it, one could imagine other reasons, for example, the fact that they are more closely connected to their constituent or the fact that they have a stronger connection with the office of the president.
Can anybody explain the reasons why it seems that senators are more influential than their House counterparts?