Double the previous margin ? Keller won 2% more of the vote than Marino did in November ‘18. I don’t know what you’re referring to with “double.”
As for California, you know my opinion on that. The Dems have stolen countless federal races and have never allowed a Republican to defeat an incumbent since 1994. Ever since then, we’ve made the presumption that when the Dems take a seat, we’ll get it back at the next term. That has yet to happen 25 years hence. I think once stolen, they stay stolen. This will not change until the Feds go into California and investigate from top to bottom and start indicting officials en masse. Start with Xavier Becerra.
As for IA and Loebsack, it looks like IL ex-Congressman Bobby Schilling, who represented the seat just across the Mississippi, is looking to run for the open seat here. If he wins, he’ll be the first person since Ed Foreman to represent two different states in Congress (he first won a West TX seat in 1962, got wiped out in the LBJ massacre of 1964, moved just across the border to NM and won the adjacent district in 1968, alas losing it to a Conservative Dem in 1970).
My no. #1 priority there would be to simply get the federal government to stop counting illegal aliens as "residents" of a Congressional district since they have no right to live there in the first place. If they only changed the rules so congressional districts only count AMERICAN CITIZENS as residents, it would cause vast demographic and population changes in California congressional districts and they'd probably lose at least four RAT Congressman outright.