CREATE TABLE table_60928 ("District" CLOB, "Incumbent" CLOB, "Party" CLOB, "First elected" FLOAT, "Results" CLOB)

Who is the incumbent for the Colorado 4 district?
SELECT "Incumbent" FROM table_60928 WHERE "District" = 'colorado 4'
SELECT "Incumbent" FROM "table_60928" WHERE "District" = 'colorado 4'