The following Wikipedia webpage contains information on past presidential debates.

url <-  "https://en.wikipedia.org/wiki/United_States_presidential_debates"

Please use this url to answer the following questions.


(1) Download the wikipedia website using the provided url.

(2) Scrape all the text from the wiki page. Collapse content into a single string.

(3) Scrape all the references from the wikipedia page and store in a tibble data.frame.

(4) Download and clean the table after the “Timeline” header on the page. Create a tidy data frame that only has the election date and the presidential candidates as variables.