I want candidates to run to represent their constituents. If they’re running for a senate seat they need to campaign to the people of their state. If they’re running for house seats, they need to campaign to the people of their districts.
Dennis Prager once considered the CA Senate, but concluded that once elected he’d spend the majority of his time “gladhanding” the moneybags so that he could run again.
He declined.
I believe in 2014 this encouragement to "nationalize the election" almost solely refers to Senate campaigns. You can run a "nationalized" big picture vision campaign for such a statewide seat and represent your constituents at the same time. It is not 'either/or'. Just a winning, instead of losing, campaign strategy. IMHO