IF a president needs to travel by bus, it should be protected. Far too many nuts on this earth.
On the other hand, buying a bus so Obama can campaign is a waste of taxpayer dollars and should be illegal. He already as Air Force One on the taxpayer bill. There is NO NEED for this kind of travel.
I also believe that WHEN a president is running for reelection that 100% of ALL expenses should be covered by his campaign. INCLUDING all costs for Air Force One, secret service so on and so forth. NO taxpayer should be funding any president's reelection bid.