You live in a representative democracy and you vote for the person in your riding. Why should your vote influence the decision of someone in Texas or California? Just because your state isn't a swing state doesn't mean your vote doesn't count.
I really don't understand how you think that you can have a PR system and keep your local representative without losing the power of your vote.
I don't want to influence the decision of someone in Texas or California. I want to influence 1 single representative in Washington.
To repeat myself from earlier in the thread. You vote for a local candidate. One or more candidates are selected from each district. If your candidate wins, then yay for you, you have your representative. If your candidates dont win then you are allowed to have your vote count towards a party's national share. If a party's national share of the vote is below their share of winning candidates, then their 'at large' candidates are elected.
So say you me and 10 million other people decide to start the dwarf party. We all vote for dwarf party candidates but we are spread out over the country so only one of our candidates won. But we expected this, so we told all the dwarf party members to remember to check off support for our candidates at large and we publish the list of those candidates so everyone can see how they are stand up great people who they would want in office. So after the tallying is done, the vote counters see that we had 5% of the vote but only one of our guys won. So they start going down our list of candidates at large and adding them to congress until our share of congress is 5%, just like our share of the vote. These candidates increase the size of congress a little, but that was expected before the country.
Now maybe the republican party had 35% of the vote exactly and won 35% of the elections so they were fine without the proportional system. But after the vote counters increase the size of congress to accommodate the third parties like the dwarf party, the republicans are now under represented. Well the answer to that is simple. The vote counters take the first few names from the republican's at large candidate list and make them representatives at large for the party. That way at the end of the day, every parties representation in congress is equal to their share of the vote. The only people who don't get any representatives at all are parties so small that they don't even deserve a single representative. With a congress the size of the US that means having less then .25% of the vote. But even they can be accommodated if they agree to pool their votes with other tiny parties.