It absolutely is, but there is still a massive motivational difference between needing campaign funds to facilitate getting re-elected and needing personal money to pay for rent/mortgage, food, childcare, etc. The latter opens the door to the kinds of bribes that, if promises made are unfulfilled, come with direct personal consequences, and potentially violent ones. By contrast, if a politician doesn’t make good on a promise made in return for campaign/PAC contributions, they typically are only risking that support being given to their opponent next time around.