Which kinda makes sense after looking at the different term times. The crazies of the House are almost always running for re-election, while the Senators have planty of time to do things correctly without needing to score too many politipoints.
They also typically have much larger constituencies, so they have to accomodate a broader range of views. The average House district is about 700,000 people. The average Senate constituency can vary dramatically but is on average considerably larger than that. In the cases of small-population states like Alaska and Wyoming, there's two Senators and only one Representative for the whole state, so those cases represent an inversion. But consider California, where each Senator is (in theory) representing about 50
million people as opposed to 700,000.
There's actually an interesting (but utterly unworkable) proposal to go back to a pre-1929 law that required a seperate Congressional district for every 30,000 people. The idea is that it would make the House more responsible to their constituents and more accessible to the people. It would also mean enlarging Congress to about 6,600 members. So, no. Not gonna happen.
The weird thing is, you'd think that with the ever-growing size of Congressional districts, it would cause House members to moderate as they have to include a wider range of views. But it doesn't seem to work that way. I guess the 2-year election cycle has a lot more to do with it.