CREATE TABLE table_21053 ("Poll Source" TEXT, "Dates administered" TEXT, "Democrat: Carl Levin" TEXT, "Republican: Jack Hoogendyk" TEXT, "Lead Margin" FLOAT)

How many times did Public Policy Polling under Republican: Jack Hoogendyk?
SELECT COUNT("Republican: Jack Hoogendyk") FROM table_21053 WHERE "Poll Source" = 'Public Policy Polling'
SELECT COUNT("Republican: Jack Hoogendyk") FROM "table_21053" WHERE "Poll Source" = 'Public Policy Polling'