Trying to build viable third parties by voting for them in presidential elections is like trying to build a third door in your house by repeatedly walking into the wall where you want the door to be.
And even if the candidate wins, then what? They have no say in Congress. It's the House of Reps and the Senate that passes legislation. Your new third party candidate can only choose to sign or to veto bills passed by the House and Senate.
Do you apply this same logic to Trump winning the election or are presidents only this powerless when they have a D next to their name and are being criticized for supporting abhorrent legislation?
I'm not making sense? You just stated that congress has all the power while now arguing that Trump would have all the power because he's "the leader of the party." That doesn't make sense as you can't have it both ways unless you're just trying to spread misinformation.
Seriously? Ok one more attempt. Trump is the leader of the republican party. The people in the republican party selected him as their leader. I don't know how to make it any clearer but I'll try with a tiny fib: Trump is the republican party. The republican party is Trump.
Trump tells his party "hey write up this legislation, do it because I'm the leader of the party that you are in". Notice that part "because I'm the leader of the party that you are in". That's not "because I am president", it's "because I'm the leader of the party that you are in". And by and large, the republican party will do that. They will listen to their party leader (the one they selected) and write up the legislation, try to pass it in the House of reps, try to pass it in the senate, and then it will land on Trumps desk.
To be more specific, the party will meet, they will discuss what they want to do, listening heavily to what the president/leader wants to do because it was his "vision" for america that got them elected, then write up legislation.
A third party candidate does not have party members in the house or senate that will do that.
If that doesn't make sense to you, you have some reading to do. I think I'm out.