Changing demographics are not the driving issue. Yes, immigration policy changes in the 1960's have driven a demographic shift, but they are not the reasons we have transitioned to a center left electorate (we used to be a center right nation ... we have changed). What's different now than a century ago when we also welcomed a massive immigrant migration is the existence of the massive government redistributive benefits consuming the majority of the budget that was virtually non-existent a century ago. It's a simplistic statement that the economy is the primary voter issue in elections. More correct is an older proverb that people vote their pocketbook ... meaning they vote based on what impacts THEM, not the nation as a whole.