You claimed McCain votes with us less than 50% of the time. IF that were true, his voting record would be compariable to Chafee (though Chafee is really really liberal, he had an ACU rating of 16%, so a more accurate comparison would be that McCain would be an Arlen Specter clone, as Specter votes "with us" about 42% of time)
Since I know McCain is nowhere near as liberal as Specter, your argument is false, ACU ratings or not.
Furthermore, I can probably find half a dozen DIFFERENT conservative organizations (not single issue organizations like say, Americans for Immigration Reform) that rank members of Congress, and McCain will score well over 50% "with us" on ALL of them.
Your allegations claiming we don't get McCain to support at least 50% of our positions is simply false. McCain votes like a DemocRAT on a handful of issues like immigration and ANWR, but on the majority of issues out there, he supports the conservative position.