The way it works in other countries, political parties have specific platforms that they promise to implement, and more or less detailed policy positions that they are on record as holding.
The way it works in the USA has always been different from the way it works in other countries.
Many of the "other countries" are under a parliamentary system. The electorate chooses a political party, based on platform. The party appoints the administration. There is tight party discipline, partly because the cabinet is appointed from the legislature.
In the USA, the electorate selects the administration separately from its selection of members of the legislature. The cabinet is not part of the legislature, so is not beholden to the majority party. Party discipline has traditionally been weak, with some legislators taking independent stands on individual bills, voting against the majority of their party.
The Republicans recently attempted to institute tight party discipline, with Newt Gingrich being one of the originators of that plan. In my opinion, this has been an unmitigated disaster. Let's get back to the traditional US form of government. Some degree of indecision and bumbling incompetence is to be preferred over a single minded march over the edge of the cliff.
Just say no to McCain 2008; he abandoned principle when he caved on habeus corpus