On his “The Only Former U.S. Senator Now on Tour Tour,” Al Franken is proudly singing the praises of Sen. Ted Cruz, R-Texas, and denouncing the Grateful Dead as the most boring and overrated band of all time. April Fools’! A former “Saturday Night Live” TV comedy mainstay and Democratic senator from Minnesota, Franken loathes Cruz. But he loves the Dead. Now a New York resident, Franken estimates that — since 1973 — he has attended between 50 and 60 concerts by the Dead. The pioneering jam band’s 1978 and 1980 “SNL” performances were largely the result of enthusiastic lobbying by Franken and h…
