To be clear, it's illegal for corporations to give money directly to federal candidates. This is a tally of donations from employees of those companies, which makes this a function of workforce ideological leanings more than anything else.
Comcast and AT&T have the ability to force consumers to pay more with no chance of losing revenue. Regional broadband monopolies + no net neutrality allows them to,
1, Zero-rate their own video services [1]
2, Throttle competitors like Netflix
3, Charge competitors more, passing on costs to consumers
