Get yahoo comments with web scraping

I'm trying to get the news comments on yahoo, where there is a link "See reactions", with the following id: "caascommtbar-wide" and tried to get the element with CasperJS, Selenium, ScrapySharp, to click on the link and display the comments, but in those tools you never find the element and I've even tried using the XPath

CasperJS:
casper.then (function () {

if (this.exists ('a.caascommtbar-anchor')) {
this.echo ("It exists");
} else
this.echo ("It Does not Exist");

});

casper.then (function () {
// Click on 1st result link
this.click ('a.caascommtbar-anchor');
});

Selenium:

driver.FindElement (By.Id ("caascommtbar-anchor")). Click ();

Does anyone know why you can not access this part of the HTML code where the comments are located?