Why according to garraty has the growth of persidential primaries made the selection of the vice president less demcratic?

According to Garraty, the growth of presidential primaries has made the selection of the vice president less democratic because it shifts the focus of the nomination process from party leaders to primary voters. This creates a scenario where the presidential candidate often chooses a running mate based on electoral strategy rather than party consensus or merit. As a result, the vice presidential selection becomes more about securing votes than reflecting the party's broader democratic ideals. This shift can dilute the influence of party members and diminish the collaborative nature of the selection process.