I'm going to make a wild guess that there are more pork eaters than cyclists in America. Bike lanes are compicated issues but everyone has to eat. Politicians are always going to make these calculated decisions. I have also observed that the quickest way to fire up an angry mob is to say something perceived to be critical of cyclists.
Pork doesn't mean literal pork- in fact, as far as I know the infrastructure bill doesn't spend a cent on subsidies to pig, or any other, farming, though it does include improvements to rural roads, water supplies and broadband which will help farmers.
Pork, short for "pork-barrel politics", is a US term originating in the 19th century which refers to the practice of spending money in a legislator's district to get their support.