Proportional systems in fact would minimize the electoral impact of campaign spending. Candidates would be able to win with a lower percentage of votes. Candidates from the same party also would be able to campaign as a team, sharing campaign costs. Most districts would have bi-partisan representation and more balanced representation of factions within a major party, meaning that most voters would be able to approach a representative who generally shares their views on issues. Proportional systems are used in many American elections and in most other well-established democracies.
Some proportional systems are very simple to describe.
Others sound complicated when first described, but experience shows that voters quickly can learn the new rules. The president would be elected separately. Not on issues. Republican voters are likely to be unhappy with the voting record of a Democratic representative and vice versa. Proportional systems likely would result in bi-partisan representation of most districts, meaning that supporters of the major parties likely would have at least one representative whose voting record generally reflected their views on issues.